Problems
                     
                        Minimum Absolute Difference in an Array | 
                  
               
                     
                        Programming shorthands / tricks | 
                  
               
                     
                        How to get the number from the middle of a string | 
                  
               
                     
                        Delete all the nodes from a binary tree | 
                  
               
                     
                        Create a bar chart from json |